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Data from Steam — Steam Web API Terms of Use. Last updated .
| Achievement | How to unlock | Unlocked by | Rarity |
|---|---|---|---|
| Arcade Style Third Mini Boss in 2P | Help the third mini boss cross the rainbow bridge without assistance in 2P single player | 5% | Rare |
| Defeat Eighth Boss in 2P | Leave the eighth boss in the ocean in 2P single player | 5.1% | Rare |
| Arcade Style Second Mini Boss | Pump the second mini boss full of lead without assistance | 5.2% | Rare |
| Defeat Seventh Boss in 2P | Show the seventh boss its ending cutscene in 2P single player | 5.3% | Rare |
| Arcade Style Third Boss in 2P | Eliminate the third boss without assistance in 2P single player | 5.8% | Rare |
| Deal with the sixth boss in 2P single player | 5.9% | Rare | |
| Pull the plug on the sixth mini boss in 2P single player | 6.6% | Rare | |
| Eliminate the second boss without assistance | 6.7% | Rare | |
| Pump the second mini boss full of lead without assistance in 2P single player | 6.8% | Rare | |
| Put the fourth boss six feet under in 2P single player | 7.1% | Rare | |
| Help the third mini boss cross the rainbow bridge in 2P single player | 7.8% | Rare | |
| Void the fifth mini boss's lifetime warranty | 8.3% | Rare | |
| Eliminate the second boss without assistance in 2P single player | 8.7% | Rare | |
| Return the third boss to its maker in 2P single player | 9% | Rare | |
| Pick up a bomb | 9.6% | Rare | |
| Eliminate the first boss without assistance in 2P single player | 9.6% | Rare | |
| Show the first mini boss who's in charge without assistance in 2P single player | 9.8% | Rare | |
| Try a full co-op game | 9.9% | Rare | |
| Pump the second mini boss full of lead in 2P single player | 10% | Rare | |
| Complete the game using only one credit | 11.5% | Rare | |
| End the existence of the ninth boss | 11.5% | Rare | |
| Send the tenth mini boss to hell | 11.7% | Rare | |
| Crush the spirit of life out of the second boss in 2P single player | 12% | Rare | |
| Show the first mini boss who's in charge in 2P single player | 12.1% | Rare | |
| Turn the first boss in the game into dust in 2P single player | 12.2% | Rare | |
| Leave the eighth boss in the ocean | 12.4% | Rare | |
| Eliminate the first boss without assistance | 12.9% | Rare | |
| Show the seventh boss its ending cutscene | 13% | Rare | |
| Deal with the sixth boss | 13.9% | Rare | |
| Turn the fifth boss into shards | 15.2% | Rare | |
| Pull the plug on the sixth mini boss | 15.4% | Rare | |
| Put the fourth boss six feet under | 17.4% | Rare | |
| Help the third mini boss cross the rainbow bridge | 19% | Rare |